[MATLAB毕业设计] Warning: Data clipped during write to file:123.wav是怎么回事

[gexiaohua]

出错信息：
In wavwrite>PCM_Quantize at 241
In wavwrite>write_wavedat at 267
In wavwrite at 112
In Myfilter6 at 42
程序：
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clear;clc
[y,Fs,NBITS]=wavread('123.wav');
Y=fft(y,262144);
f=[0 0.2 0.2 1];
m=[0 0 1 1];
b=fir2(30,f,m); %fir2用来设计任意频率响应的频率取样的数字FIR滤波器,b是n+1的一维向量
[H,w]=freqz(b,1,262144,'whole'); %w的范围是0~2π
Y_OUT=Y.*H;
y_out=ifft(Y_OUT,262144);
wavwrite(y_out,Fs,NBITS,'123(修改).wav')
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我不知道是否是因为点数262144太大的原因……
请各位大侠帮帮忙解决一下，谢谢了。